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.TH TCSETPGRP 3C "Aug 14, 2002"
.SH NAME
tcsetpgrp \- set foreground process group ID
.SH SYNOPSIS
.LP
.nf
#include <sys/types.h>
#include <unistd.h>

\fBint\fR \fBtcsetpgrp\fR(\fBint\fR \fIfildes\fR, \fBpid_t\fR \fIpgid_id\fR);
.fi

.SH DESCRIPTION
.sp
.LP
If the process has a controlling terminal, \fBtcsetpgrp()\fR will set the
foreground process group \fBID\fR associated with the terminal to
\fIpgid_id\fR. The file associated with \fIfildes\fR must be the controlling
terminal of the calling process and the controlling terminal must be currently
associated with the session of the calling process. The value of \fIpgid_id\fR
must match a process group \fBID\fR of a process in the same session as the
calling process.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fB0\fR is returned. Otherwise, \fB\(mi1\fR is
returned and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBtcsetpgrp()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The \fIfildes\fR argument is not a valid file descriptor.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
This implementation does not support the value in the \fIpgid_id\fR argument.
.RE

.sp
.ne 2
.na
\fB\fBENOTTY\fR\fR
.ad
.RS 10n
The calling process does not have a controlling terminal, or the file is not
the controlling terminal, or the controlling terminal is no longer associated
with the session of the calling process.
.RE

.sp
.ne 2
.na
\fB\fBEIO\fR\fR
.ad
.RS 10n
The process is not ignoring or holding \fBSIGTTOU\fR and is a member of an
orphaned process group.
.RE

.sp
.ne 2
.na
\fB\fBEPERM\fR\fR
.ad
.RS 10n
The value of \fIpgid_id\fR does not match the process group \fBID\fR of a
process in the same session as the calling process.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe, and Async-Signal-Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR tcgetpgrp (3C),
.BR termio (4I),
.BR attributes (7),
.BR standards (7)
